Theodore burr



STATES @Ntra THEODORE BURR, OF BATTLE GREEK, MICHIGAN, ASSIGNOR TO HIMSELF BATENT arie.

AND ISAAC C. MOTT, OF SAME PLAGE.

Specification forming part of Letters Patent No. 40,5311, dated November 3, 1863.

To @ZZ whom, it may concern:

Be it known that I, THEODORE BURR, of Battle Greek, in the county of Calhoun and State of Michigan, have invented a new and useful I1n1iroven'1ent in lVIachines for Cutting' Files, Rasps, the.; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, making a part of this specification, in which- Figures l and 2 are right and left side elevations of my improved machine. Fig. 3 is a vertical central section through the machine.l Fig. 5 is a front elevation of the same, and Fig. 4 is a perspective view of the chisel used in the machine.

Similar letters of reference indicate corresponding parts in the several figures.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

The two upright sides a a, which are suitably strengthened by cross-ties, constitute the framework of the machine for containing and supporting the machinery used in supporting, guiding, feeding, and cutting the files.

a a are two guide-ways, which incline to ward the front part of the machine at any desired angle, and between these ways works a quadrangular block, b, which is drilled out to receive the shanks of the chisels used in cutting files. This chisel-stock b has a central opening, c, through it, which opening is directly above the hole which receives the chisels-i. e., the hole c is in the middle of the stock, and the object of this hole is to receive an adjustable spring, which gives'force to the stock in its downward stroke, as will be hereinafter described.

The upper end of the chisel-carrying stock b carries a loop, d, which is acted upon by the came on the main driving-shaft e', thus giving an alternate rising or lifting movement to the chisel-stock b as the arms of the cam act upon the loop. The downward stroke of the chisel-stock is effected by the combined action of a spring, j', and the weight of the stock itself. The spring f is shown clearly in Fig. 3, and it will be seen that one end of this spring f bea-rs upon the stock b, entering the hole c, while the other end of the spring is rigidly secured to a transverse rock-shaft, g,

which carries on one end, outside of the frame a., a curved lever-arm, g', by means of which the shaft g can be rocked and the pressure of the spring f upon the chisel-stock b regulated. The lever g has a pin, It, projecting from its side and near its outer end, which pin enters one or the other of the Vdepressions z', Fig. 2, which are described on the arc of a circle concentric with the axis of the rockshaft g, thus allowing the lever g to be adjusted and set at any desired point, according` to the amount of force which it is desired to give the chiselstock. The lever g is made somewhat elastic, so that it will force the pin h against the side a of the machine and keep this pin in the position in which it has been set. By this arrangement the force of the downward stroke of the chisel-stock b can be increased or diminished at pleasure and while the machine is in operation.

B represents a large rollin glied, upon which the iiles are cut. This bed is a cylinder, the axis of which isin a planewith theaxis of the stock of the chisel 7c. rIhe shaft of the cylindrical bed B carries on one end a large spurwheehj, and on the other end a large bandwheel, l. The latter is intended to give motion to the lower feed-roller,m, of the twin rollers m m', and the former engages with a a pinion-spur, (not shown,) which is keyed to the shaft n, carrying on its end the ratchetwheel n. This ratchet-wheel is actuated by means of a springpawl, p, pivoted to a rocking lever, p', which receives its motion from a crankwheel, r, through the medium of pitman r', and the crankwheel ris in turn driven by a pinion, s, which receives its motion from a large spur-wheel, s', on the main drivingshaft c. By means of this train of wheelwork, the main shaft c communicates a regnlar feed-motion to the work which is put between the feed-rollers m m and rests on the cylindrical bed B. The main shaft c is in this way made the motor for the tool-stock b and for the feed-rollers fm, m and rolling-bed B, which enables me to adapt the strokes of the chisel-stock to movement of the feed-rollers and by these means obtain a harmonious movement of the whole machine.

The adjustment for regulating the amount of feed-motion according to the degree of fineness itis desired to cut the les is obtained by setting the pitman r in one or the other of the holes in the lever p', and, by this shortthe upper roller, m, is acted upon by rubberv or other springs t t, in its bearings, which keep the tile-blank down on the feed-roller m, and also upon the` rolling-bed B. It Will be seen,by reference to Fig. 3, that the springroller presses upon the blank at a point Which is between the feed-roller m and the rollingbed, thus keeping the blank in its place and pressing it equally upon both rollers m and B, and as the chisel k strikes perpendicularly to the axis of this rolling-bed B there will be no tendency of the chisel to slip the blank in either direction in the operation of producing the tile-surface 011 the blanks.

In cutting files which have onel rounded surface, triangular files, &c., aI groove, 11,is formed around the rolling bed or cylinder B .to receive the rounded or angular surfaces and to keep the blanks in asteady, iixed position to receive the edge of the chisel properly; and in cutting tiles with incl ned surfaces 1 employ a chisel which is pivoted to its stock, as shown clearly in Fig. 4. By thus pivoting the chiselpoint 7c to its stock r, it Will be seen that the cnttingedge will adapt itself to inclinations from a horizontal plane, and

should the blanks (of square or flat files) from,

any cause become disarranged While being cut, the chisel 7c will still make the ridges or abrasions uniform from one side to the other of the ilc, Whereas, if the chisel'point was rigidly fixed to ils stock or shank, it would only cut in a plane parallel with the surface of the rolling-cylinder B, and in many cases the cuts or fur-rows made in the tile-blanks would be deeper at one side of the tile than at the other. i

The advantages of the rolling-bed B, upon which the files are cut, over the `flat bed hitherto used, are as follows Most iiles are made tapering from end to end-9i. e., they are thinner and narrower at the ends than at the middle, producing what is called bellied tiles.

It istherefore necessary, in cutting the tile-y surface on such blanks, to be very careful that the entire surface of the blank, as it is fed under the chisel, is properly sustained upon its bed. Otherwise the blow of the chisel will break or so bend the blank as to render it useless. In machiney for cutting leshaving flat beds this difficulty frequently occurs. In my machine, With a rolling or cylindrical` bed B and a pressure-roller, m', for keeping the blank down on its bed, and yielding to accommodate itself to the varying-thickness ofthe blank, as above mentioned, the blanks,

of whatever size, thickness,or degree of taper, Will be supported upon a firm bed which is unvarying in its character and Which supports the blank at a point directly under the edgeo'ftheinclinedchisel. rlhen,to compensate for the varyin g thinness or taper of the blank or the hardness of the metal thereof, and to regulate the force of thel stroke of the chisel to this condition ot' the blanks, the springlever g is used, which projects` sufficiently far toward the front of the machine to be controlled by the operator, Who can, by siniply raising` or depressing this lever, increase or diminish the force of the stroke of the chisel upon the blank, and this `can bc done without stopping the machine.

I do not claim, broadly, the use of feedrollers in a file-machine, unless such `rollers constitute the bed which supports the iileblank and sustains .thc percussive force of a chisel, which is arranged to operate upon the broad surfaces of the file-blank, substantially as herein described, as I am aware that rollers acting simply as feed-rollers in a machine for nicking the edges of blankshave been used, and are shown in the Patent of Milton Whipple, dated April 1,1862. Neither do I claim the rocking-chisel. Neither do l claim', broadly, a spring made adjustable for regulating the force of the chisel.

Having thus described my invention, what I claim. as new, and desire to secure by Letters Patent, is

1. A file-cutting machine constructed with inclined Ways a a, inclined chisel-stock lZ, adjustable poWer-springf, and a rotating bed, B, all arranged substantially as described.

2. In a iilecutting machine, the combination of a rotary bed, B, feed-roller in, and spring-pressure roller m', and inclinedl cutterstock b, substantially as described.

3. Arranging the spring-pressure roller m at an intermediate point between the rollingbed B and the feed-roller m, substantially as described.

et. Cutting or producing the abraded sur- `face upon the broad sides of tiles upona cylindrical :rotating bed, substantially as 'dcscribed.

5. The combinationand arrangement, with Y the system of mechanism which actuates the i chisel and the roller-bed, of the roller-bed, i

the inclined chisel, and the spring-regulating device, all constructed and operating substantially as described.

THEODORE BURR. Witnesses:

J. W. BUCKBY, EDWIN C. NEcHoLs. 

